﻿<script src="~/Scripts/jquery-easyui-extensions/validatebox/jeasyui.extensions.validatebox.js"></script>
<script src="~/Scripts/jquery-easyui-extensions/textbox/jeasyui.extensions.textbox.setPrompt.js"></script>
<script src="~/Scripts/jquery-easyui-extensions/combo/jeasyui.extensions.combo.setPrompt.js"></script>

<div class="easyui-panel" data-options="fit:true,border:false" style="padding:15px;">
    <input id="c1" name="c1" type="text" value="" class="easyui-combo" data-options="prompt:'默认显示的prompt文本'" />
    <br /><br /><br />
    <a id="btn1" class="easyui-linkbutton">重新设置上述 combo 的 prompt </a>
</div>
<script>
    $(function () {
        $("#btn1").click(function () {
            $("#c1").combo("setPrompt", "重新设置后的prompt文本");
        });
    });
</script>